1990 年 3 巻 2 号 p. 74-77
Fetal intracranial arterial velocimetries were serially performed on 40 pregnant women with regular menstrual cycle, at 28-40 weeks of gestation, using color and pulsed Doppler ultrasound. The change in fetal intracranial arterial hemodynamics was based on the calculation of resistance index (RI) . RI in the anterior cerebral artery (ACA), middle cerebral artery (MCA) and posterior cerebral artery (PCA) showed significant changes with advancing gestational age, respectively. There was no signficant difference between the RI values in the ACA and MCA from 28 weeks to term. The RI in the PCA was significantly lower than that in the ACA and MCA, respectively, from 28 weeks to term (p<0.001) . This color and pulsed Doppler ultrasound assessment of fetal intracranial arterial blood flow provides a useful foundation for elucidating normal intracranial hemodynamics and wiil aid in avoiding misinterpretations of the different intracranial arteries.